Radiogenic heat production in the upper third of continental crust from KTB

Pribnow, D.; Winter, Helmuth

doi:10.1029/96gl03929

Cited by 15 publications

(8 citation statements)

References 14 publications

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“…Our heat production data indicate that the exponential heat production model is not applicable to the Dabie-Sulu UHPM Belt. Our data show a clear lithological dependence of the heat production, as shown in the German KTB deep borehole [Pribnow and Winter, 1997].…”

Section: Heat Production Versus Depthsupporting

confidence: 75%

“…However, many studies have called this model into question [ Jaupart and Mareschal , 2003]. The heat production often changes in a stepwise fashion across lithological boundaries [ Pribnow and Winter , 1997; Brady et al , 2006]. In the upper crust, the heat production tends to first increase then decrease with depth [ Hart et al , 1981; Nicolaysen et al , 1981; Ashwal et al , 1987; Kremenetsky et al , 1989; Ketcham , 1996].…”

Section: Radiogenic Heat Productionmentioning

confidence: 99%

“…The deep boreholes allow examinations of the vertical distribution of the radiogenic heat production in the upper crust. All the three deep holes indicate that the radiogenic heat production is strongly correlated with lithology and does not decrease exponentially with depth [ Arshavskaya et al , 1987; Pribnow and Winter , 1997]. …”

Section: Comparison With Other Deep Boreholesmentioning

confidence: 99%

“…A preliminary numerical model based on seismic data [ Yang et al , 2006b] is constructed to explain the variation of the heat flow with depth. We also discuss the tectonic implications of the results from CCSD MH and compare them to the results from the Kola superdeep well SG‐3 [ Arshavskaya et al , 1987; Pribnow and Winter , 1997; Popov et al , 1999b] and the main hole of the German Continental Deep Drilling Program (KTB HB) [ Clauser et al , 1997]. …”

Section: Introductionmentioning

confidence: 99%

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Heat flow study at the Chinese Continental Scientific Drilling site: Borehole temperature, thermal conductivity, and radiogenic heat production

He¹,

Hu²,

Huang³

et al. 2008

J. Geophys. Res.

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[1] The Chinese Continental Scientific Drilling (CCSD) Project offers a unique opportunity for studying the thermal regime of the Dabie-Sulu ultrahigh-pressure metamorphic belt. In this paper, we report measurements of borehole temperature, thermal conductivity, and radiogenic heat production from the 5158 m deep main hole (CCSD MH). We have obtained six continuous temperature profiles from this borehole so far. The temperature logs show a transient mean thermal gradient that has increased from 24.38 to 25.28 K km À1 over a period of about 1.5 years. We measured thermal conductivities and radiogenic heat productions on more than 400 core samples from CCSD MH. The measured thermal conductivities range between 1.71 and 3.60 W m À1 K À1 , and the radiogenic heat productions vary from 0.01 mW m À3 to over 5.0 mW m À3 , with a mean value of 1.23 ± 0.82 mW m À3 for the upper 5-km layer of the crust. The heat productions in CCSD MH appear to be more rock-type than depth-dependent and, over the depth range of CCSD MH, do not fit the popular model of heat production decreasing exponentially with increasing depth. The measured heat flow decreases with depth from $75 mW m À2 near the surface to $66 mW m À2 at a depth of 4600 m. High heat flow anomalies occur at $1000 and $2300 m, and low anomalies occur at 3300-4000 m. A preliminary two-dimensional numerical model suggests that both radiogenic heat production and thermal refraction due to structural heterogeneity are at least partially responsible for the vertical variation of heat flow in CCSD MH.

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Section: Heat Production Versus Depthsupporting

confidence: 75%

Section: Radiogenic Heat Productionmentioning

confidence: 99%

Section: Comparison With Other Deep Boreholesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Heat flow study at the Chinese Continental Scientific Drilling site: Borehole temperature, thermal conductivity, and radiogenic heat production

He¹,

Hu²,

Huang³

et al. 2008

J. Geophys. Res.

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“…Rocks drilled are mainly paragneiss and metabasites (amphibolites, metagabro) (Pribnow and Winter, 1997). Measured data show lithology related variations in heat production.…”

Section: Ktb Borehole (Germany)mentioning

confidence: 93%

Fractal behavior in continental crustal heat production

Vedanti

Srivastava

Pandey

et al. 2011

Nonlin. Processes Geophys.

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Abstract. The distribution of crustal heat production, which is the most important component in the elucidation of continental thermal structure, still remains a theoretical assumption. In general the heat production values must decrease with depth, but the form of decrease of heat production in the crust is not well understood. The commonly used heat production models are: "block model", in which heat production is constant from the surface to a given depth and the "exponential model", in which heat production diminishes as an exponential function of depth. The exponential model is more widely used wherein sources of the errors are heterogeneity of rock and long wavelength changes due to changes in lithology and tectonic elements, and as such exponential distribution does not work satisfactorily for the entire crust. In the present study, we analyze for the first time, deep crustal heat production data of six global areas namely Dharwar craton (India), Kaapvaal craton (South Africa), Baltic shield (Kola, Russia), Hidaka metamorphic belt (Japan), Nissho pluton (Japan) and Continental Deep Drilling site (KTB, Germany). The power spectrum of all the studied data sets exhibits power law behaviour. This would mean slower decay of heat production with depth, which conforms to the known geologic composition of the crust. Minimum value of the scaling exponent has been found for the KTB borehole, which is apparently related to higher heat production of gneisses, however for other study areas, scaling exponent is almost similar. We also found that the lower values of scaling exponents are related to higher heat production in the crust as is the case in KTB. Present finding has a direct relevance in computation of temperature-depth profiles in continental regions.

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Heat flow, heat production, and crustal temperatures in the Archaean Bundelkhand craton, north‐central India: Implications for thermal regime beneath the Indian shield

et al. 2017

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Heat flow and heat production data sets constrain the crustal thermal structure in the 2.5–3.5 Ga Bundelkhand craton, the oldest cratonic core in northern Indian shield, for the first time and allow comparisons with the southern Indian shield. Temperature measurements carried out in 10 boreholes at five sites in the craton, combined with systematic thermal conductivity measurements on major rock types, yield low heat flow in the range of 32–41 mW m−2, which is distinct from the generally high heat flow reported from other parts of the northern Indian shield. Radioelemental measurements on 243 samples of drill cores and outcrops reveal both large variability and high average heat production for the Neo‐Archaean to Palaeo‐Proterozoic granites (4.0 ± 2.1 (SD) μW m−3) relative to the Meso‐Archaean tonalite‐trondhjemite‐granodiorite (TTG) gneisses (2.0 ± 1.0 (SD) μW m−3). On the basis of new heat flow and heat production data sets combined with available geological and geophysical information, a set of steady state, heat flow‐crustal heat production models representative of varying crustal scenarios in the craton are envisaged. Mantle heat flow and Moho temperatures are found to be in the range of 12–22 mW m−2 and 290–420°C, respectively, not much different from those reported for the similar age Dharwar craton in southern India. This study reveals similar mantle thermal regimes across the northern and southern parts of the Indian shield, in spite of varying surface heat flow regimes, implying that much of the intraprovince and interprovince variations in the Indian shield are explained by variations in upper crustal heat production.

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Radiogenic heat production in the upper third of continental crust from KTB

Cited by 15 publications

References 14 publications

Heat flow study at the Chinese Continental Scientific Drilling site: Borehole temperature, thermal conductivity, and radiogenic heat production

Heat flow study at the Chinese Continental Scientific Drilling site: Borehole temperature, thermal conductivity, and radiogenic heat production

Fractal behavior in continental crustal heat production

Heat flow, heat production, and crustal temperatures in the Archaean Bundelkhand craton, north‐central India: Implications for thermal regime beneath the Indian shield

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